## Relationship between entropy and volume in liquids

$\Delta S = \frac{q_{rev}}{T}$

Mary Becerra 2D
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Joined: Fri Sep 29, 2017 7:06 am

### Relationship between entropy and volume in liquids

I know that when you increase the volume of a gas, you increase the entropy since the gas now has more positions available to it, however, is this the same with liquid? Or do you have to take gravity into account since that would limit its positions? For example, would entropy increase for a liquid if you expanded the volume of a liquid in zero gravity, which would make its behavior more gas-like?

Ethan Vuong 3G
Posts: 51
Joined: Fri Sep 29, 2017 7:07 am

### Re: Relationship between entropy and volume in liquids

Yeah so the entropy of gas molecules are much larger than that of liquid and solid molecules. Would zero gravity make it seem more gas like? I feel like for water to be more gas like, there has to be some vaporization, but that would just be a phase change and that would affect the entropy.

Allison Young 1K
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Joined: Fri Sep 29, 2017 7:06 am

### Re: Relationship between entropy and volume in liquids

Liquids have a definite volume, so you can't expand the volume. Only gases can expand. In zero gravity, I think the total volume of the liquid is the same, but it would just be in different places, like if you had a bunch of separate containers of water.

Yixin Angela Wang 2H
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Joined: Thu Jul 27, 2017 3:00 am

### Re: Relationship between entropy and volume in liquids

I don't think you can really compress or expand a liquid's volume, but you can increase its entropy by mixing it with another substance or increasing its temperature.

Irma Ramos 2I
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Joined: Fri Sep 29, 2017 7:07 am

### Re: Relationship between entropy and volume in liquids

In lecture, it was mentioned how entropy increases as a solid melts or turns into a liquid, and entropy decreases when a liquid goes to a solid. This would support the above post about the relationship between temperature change and entropy.

Abby Ellstrom 1I
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Joined: Fri Sep 29, 2017 7:04 am

### Re: Relationship between entropy and volume in liquids

If you increase the volume of any substance, the entropy also increases. However the entropy of gas is much larger than that of liquids.

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